12 whopping mistakes in your fave TV shows spotted by nitpicking fans

We all make mistakes - but, luckily for most of us, our slip-ups won't be immortalised on TV screens.

Spare a thought then for all those writers, production designers, directors, and animators, who work their tails off to make our favourite TV shows, only for some very human on-screen errors to slip through the net - and onto the 'net.

Doubles are regularly used in TV and movies for blocking, lighting set-ups, reaction shots and reshoots so that actors don't have to hang around unnecessarily for all hours of the day. They're not supposed to appear on screen, but one theory of why doubles are visible in these episodes is that Friends was originally filmed in a standard aspect ratio (4:3), whereas today we're watching them on a widescreen standard ratio (16:9). In other words, maybe you can see more in a shot now that you were originally meant to.

Actually, perhaps that Rachel double is the same woman in Rachel's passport photo, spotted by this fan in the show's final episode?

Another popular Friends blooper had this background extra behind Ross taking a slurp from a cup of coffee - and then start to chew it. Twitter user Nick Turner went viral when he shared the clip.

Corrie's soap rival EastEnders had an all-time great mistake during its 30th anniversary live episode in 2015. It involved actress Jo Joyner (aka Tanya Branning), who was supposed to be inquiring after Ian Beale (Adam Woodyatt).